Its discharge will be ‘attracted’ to a leak since this represents a path to ground through the residual gas inside the system. I was thinking that for a quick test of a vacuum pump or system, a DC or RF source to excite a discharge inside a glass tube could be used to provide an indication of the pressure based on brightness, color, and pattern of the glow. Somewhat similar approaches can be used to determine (destructively) the pressure inside things like light bulbs and flashlamps – break them in oil under an inverted container to catch the gas bubbles and compare the bubble volume to the total volume of the (former) lamp or whatever. If the tube dimensions and electrode material were standardized, then while not a substitute for any sort of real vacuum gauge, this should be able to indicate the pressure to within an order of magnitude or better at least.

Ideal For: There can’t be a better gesture to show care and concern towards the special ladies in your life! For the REALLY cheap, I think a better solution would be a Pirani gauge built from an industry standard lamp, say, an automobile tail light bulb. A Pirani gauge won’t go quite as low as a TC gauge without fancy electronics but it will go a little higher, handy for some laser projects. Coarse vacuum gauge – Closed-end manometer (mercury filled). Fine vacuum gauge – Closed-end manometer (diffusion pump oil filled). PVC tubing to a brass “T” with the TC gauge tube, and then via more PVC tubing to the pump inlet. The tube could be installed on the pump’s inlet to test just the pump or in any convenient port of a complete system. The inlet cover gasket may be leaking slightly as I removed the cover to check for debris in the inlet filter but didn’t have a replacemnt. August 1998 (exact date unknown): An upcoming article on Kool-Aid Days (see the next section of the FAQ) that may or may not include part of an interview with Paul Dawson-Schmidt, Keeper of the Kool-Aid FAQ. Unless you’re an experienced Kool-Aid user & you know what you’re doing.

Following this should be a flow restricting orifice (or metering valve with a small maximum size opening) followed by a relief valve (set for a few psi at most – just over 1 atm) to protect your glasswork and other low pressure tubing from ‘accidents’ that might have unfortunate consequences! You cannot hook a 2,000 psi gas cylinder directly to your laser! This is why laser makers refer to the fill valve as a “buzz”, It really does a buzz sound with sharp clicks when running. That’s why many old neon guys got away with using that for the vacuum gauge. In the same batch of neon electrodes, I’ve seen some that would go out at 7 or 8 micron and others that would still be glowing faintly when my micron gauge zeros. Mesh makes it easy to shake sand out of the bag too. Madewell’s Knotted Woven Leather Crossbody Bag is a fan favorite, with reviewers raving that it’s a great size and feels high quality despite its price. Made from sustainable Moroccan date palm leaves and equipped with strong leather handles held together with heavy-duty white stitching, you’ll never have to worry about this bag falling apart.

It features supple lamb leather woven into the brand’s signature intrecciato pattern with a elevated gold knot detail. It doesn’t seem to mind elevated temperatures either. Few things feel as quintessentially spring and summer as the go-to straw bag. Picnic in the park: If you love to spend a sunny afternoon in the park, you’ll need a large basket bag for carrying beverages, snacks, and reading material. You’ll soon need a tote for all your summer essentials. There are a few summer staples that will always be in style: a linen dress, a chambray shirt, and a straw bag (a.k.a wicker or woven bags). One of those uses is this straw tote bag. Tommy Bahama Straw Bucket bag. We love the rustic chic style of this classic straw bag. To help you out, I spoke with stylists and fellow editors, as well as used my own first-hand experience to compile a list of the best straw bags.