Spring scale

spring balancespring scales
A spring scale or spring balance or newton meter is a type of weighing scale.wikipedia
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Mass

inertial massgravitational massweight
A spring scale cannot measure mass, only weight.
In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale, rather than balance scale comparing it directly with known masses.

Weighing scale

scalesscalebalance
A spring scale or spring balance or newton meter is a type of weighing scale.
A spring scale measures mass by reporting the distance that a spring deflects under a load.

Hooke's law

spring constantforce constantelasticity tensor
It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
It is also the fundamental principle behind the spring scale, the manometer, and the balance wheel of the mechanical clock.

Weight

gross weightweighingweigh
A spring scale cannot measure mass, only weight.
These variations alter the relationship between weight and mass, and must be taken into account in high precision weight measurements that are intended to indirectly measure mass. Spring scales, which measure local weight, must be calibrated at the location at which the objects will be used to show this standard weight, to be legal for commerce.

Salter Housewares

George Salter's Spring WorksRichard SalterSalter
The first spring balance in Britain was made around 1770 by Richard Salter of Bilston, near Wolverhampton.
The firm began life in the late 1760s in the village of Bilston, England when Richard Salter, a spring maker, began making the first spring scales in Britain.

Safety valve

RamsbottomSalterRamsbottom safety valves
They also applied the same spring balance principle to steam locomotive safety valves, replacing the earlier deadweight valves.
A valve less sensitive to sudden accelerations used a spring to contain the steam pressure, but these (based on a Salter spring balance) could still be screwed down to increase the pressure beyond design limits.

Bilston

Bilsetna-tunBilston Town HallSt Leonard's Church, Bilston
The first spring balance in Britain was made around 1770 by Richard Salter of Bilston, near Wolverhampton.
Richard Salter began making the first spring scales in Britain in Bilston in the late 1760s.

Spring (device)

springspringsspring-loaded
It consists of spring fixed at one end with a hook to attach an object at the other.

Elevator

liftliftselevators
This can be shown by taking a spring scale into an elevator, where the weight measured will change as the elevator moves up and down changing velocities.

Truck

lorrylorriestrucks
Main uses of spring balances are to weigh heavy loads such as trucks, storage silos, and material carried on a conveyor belt.

Silo

grain silostorage silosilos
Main uses of spring balances are to weigh heavy loads such as trucks, storage silos, and material carried on a conveyor belt.

Conveyor belt

conveyor beltsconveyorsconveyor
Main uses of spring balances are to weigh heavy loads such as trucks, storage silos, and material carried on a conveyor belt.

Wolverhampton

City of WolverhamptonWolverhampton, West MidlandsWolverhampton CB
The first spring balance in Britain was made around 1770 by Richard Salter of Bilston, near Wolverhampton.

Measuring instrument

instrumentscientific instrumentinstruments
Spring scale

Bossi-Bonomi Pedaliante

Pedaliantehuman-powered planePedaliante'' ("Pedal Glider")
A spring scale was attached to the tow line to sense the force exerted by the bicyclist, the results confirming that a speed at which the necessary lift could be obtained was indeed attainable.

Benjamin Dearborn

His inventions include the gold standard balance, spring scale, grist mill, candlestick, ballot box, perspective drawing machine, letter-press, "musical board for the instruction of the blind," thermoscope, vibrating steelyard balance, and perpendicular lift.

Steam locomotive

steam locomotivessteamsteam train
As there was nothing to prevent the weighted lever from bouncing when the locomotive ran over irregularities in the track, thus wasting steam, the weight was later replaced by a more stable spring-loaded column, often supplied by Salter, a well-known spring scale manufacturer.

Force gauge

Force gauge and Force Sensor
Spring scale, strain gauge

Centrifugal force

centrifugalcentrifugal accelerationcentrifugal effect
If an object is weighed with a simple spring balance at one of the Earth's poles, there are two forces acting on the object: the Earth's gravity, which acts in a downward direction, and the equal and opposite restoring force in the spring, acting upward.

Force

forcesattractiveforce vector
A static equilibrium between two forces is the most usual way of measuring forces, using simple devices such as weighing scales and spring balances.

Mettler Toledo

Mettler-ToledoToledo ScaleToledo Scale Company
He felt that many of his competitors who used spring scale technology, especially Dayton Scale Company, were allowing merchants to cheat their customers by incorrectly calculating the total price of a measured good.

Prony brake

de Prony brake
A friction band is wrapped around half the drum's circumference and each end attached to a separate spring balance.

Loading arm

arms
Balancing of the arm is made by counterweight or by a spring balance cylinder.

Lawrence Hargrave

HargraveHargrave box kiteHargrave's Box Kites
Aided by James Swain, the caretaker at his property, the kite line was moored via a spring balance to two sandbags (see image).