Hilger & Watts TA-30 Micrometer Water Level - Like New

This is a Hilger & Watts model TA-30 Micrometer Water Level apparatus, complete with several optional accessories. The water level consists of two precision and perfectly matched graduated cylinders with a length of hose for connecting the two. The cylinders may be placed on level surfaces some distance apart (determined somewhat by the length of hose, but to maintain accuracy, should be less than 30 feet) and by measurement of the height difference of the water column, the difference in height of the two surfaces can be determined to an accuracy of 0.001 inches. The set includes the matched cylinders (which have cross-mounted spirit levels), three micrometer measurement spindles – only one of which is used for measurement – there are two spares; and a pair of optional illuminators on articulating arms. Also includes a vial of ‘spare’ gramophone needles used for determining the level of the liquid. The apparatus comes fitted in a multi-compartmented wooden transport case. Most of the items appear to be unused (original? cosmoline still on cylinder reference surfaces). One of the extra measuring micrometers appears to be from an earlier instrument. This is a spectacular instrument. Includes original instruction manual. Location OA 22C Photo set 961