Snatch block meter wheel

GLRC-Snatchblock-1.JPG
GLRC-Snatchblock-2.JPG
GLRC-Snatchblock-3.JPG
GLRC-Snatchblock-4.JPG

Title

Snatch block meter wheel

Subject

Marine engineering; bathymetry

Description

Physical Description
A large pulley wheel in two slightly domed faces, the one communicating the axle of the pulley into a geared couting box with small dial ponters on either side.

Functional Description
As the cable passes though the main wheel, the three counters measure the lenght of line played out.  The dials are read from top to bottom, giving hundreds, tens, and ones. It is not clear how the scales are re-zeroed, except by paying out and reeling back the same amount of cord.

Creator

Steven A. Walton

Date

1960s?

Language

English

Type

physical object

Physical Dimensions

For 1/4 or 3/8 in. cable

Materials

bronze alloy, iron

Maker

Kahl Scientific Instrument Co., El Cajon,CA

Inscriptions

[on counter] KAHL S.I. CO. | El CAJON CALIF.
[3 dials, continuous rotation, marked 0-10 by 1s (numbed by 2s)] METERS [thus measuring to 999 m before rolling over]
[on case of dial] "5/32"

History of the Object

Kahl Scientific Instrument Corp. was founded in 1935 by Joseph Kahl to supply oceanographic instruments. It is apparently still in business in El Cajon, CA, though it was reincrporated with only 1 employee in 2002 and their website at www.kahlsico.com is a dead domain as of 2021

Location

GLRC

Social Bookmarking

Collection

Citation

Steven A. Walton, “Snatch block meter wheel,” Michigan Tech Inventory of Historic Scientific Instruments, accessed May 7, 2021, https://ihsi.omeka.net/items/show/193.